As zucchini plants mature, the oldest leaves often develop silver or grey blotches, streaks and spots on their upper surfaces. In this case, there is no disease or pest present, it is simply one sign of a mature leaf.Click to see full answer. Also to know is, how do you get rid of powdery mildew on zucchini?My zucchini plants got powdery mildew this year and I got rid of the mildew! As directed by my mother, I combined a tsp of baking soda with a quart of water in a spray bottle; shook it up real good so all the soda dissolved. Then sprayed each infected leaf each morning until the spots when away.Additionally, is it safe to eat zucchini with powdery mildew? Soaking leaves in hydrogen peroxide will kill powdery mildew. However, I would not recommend eating leaves with powdery mildew on them. Powdery mildew is not toxic to humans, but fungi cause allergic reactions in some people. Then, why are the leaves on my zucchini turning white? Zucchini squash plants will produce large white blotches on their leaves naturally as part of the leaf coloration. These blotches are part of the leaf and will not rub off. Powdery mildew fungus can also cause the appearance of white coloration on the leaves of squash and many other plants.Should I cut the dead leaves off my zucchini plant?When pruning zucchini plant leaves, take care not to remove all the leaves. Keep some leaves on the stem, including leaf nodes near the last fruit you want to keep. You can also cut off any dead or brown leaves that may be present. Do not cut any stems, as this will increase the risk for disease.
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